Type in unit symbols, abbreviations, or full names for units of length, area, mass, pressure, and other types. You can find metric conversion tables for SI units, as well as English units, currency, and other data. The SI unit is the pascal (Pa), with 1 millibar = 100 pascals (a hectopascal)Ĭ provides an online conversion calculator for all types of measurement units. It is not an SI unit of measure, however it is one of the units used in meteorology when describing atmospheric pressure. It is the pressure resulting from a force of one pound-force applied to an area of one square inch.Ī millibar (mb) is 1/1000th of a bar, a unit for measurement of pressure. Using the conversion formula above, you will get. Suppose you want to convert 25 mbar into pounds per square inch. Value in pounds per square inch value in mbar × 0.014503773800722. These units are mostly used in industrial environment. The pound per square inch or, more accurately, pound-force per square inch (symbol: psi or lbf/in² or lbf/in²) is a unit of pressure or of stress based on avoirdupois units. To calculate a millibar value to the corresponding value in psi, just multiply the quantity in mbar by 0.014503773800722. To calculate a pound per square inch value to the corresponding value in mbar, just multiply the quantity in psi by 68.9475728 (the conversion factor). Millibar to psi, or enter any two units below: Enter two units to convert From: Meteorologists and weather reporters worldwide often use this unit for convenience, since working in pascals would result in much larger values.ġ5 psi = 15 × 0.0689475729 bar = 1.You can do the reverse unit conversion from Millibars (symbol: mb) are also commonly used when referencing atmospheric air pressure, where atmospheric pressure equals 1013.25 mbar (101.325 kPa). The International Bureau of Weights and Measures has specified the bar as a unit that authors should have the freedom to use but has chosen not to include the bar in the list of non-SI units accepted for use with SI. The term "bar" comes from the Greek word "baros," which means weight.Ĭurrent use: Although the bar is a metric unit of pressure, it is not accepted within the International System of Units (SI) and is even deprecated within certain fields. To measure, units of measurement are needed and converting such units is an important task as well. History/origin: The unit, bar, was introduced by Vilhelm Bjerknes, a Norwegian meteorologist who founded modern weather forecasting. How do you convert bar to psi Convert with: Online bar to Pound-force per Square Inch converter Formula (the below example helps you) Example of conversions between bars and Pound-force per Square Inch (psi): Problem: Convert 10 bars to pounds per square inch Solution: Step 1 (Formula): psi bar x 14.5038 Step 2 (Put the Values): psi 10. The abbreviation for psi and mbar is pound per square inch and millibar respectively. It is equal to 0.987 atmospheres (101,325 Pa), the unit often used as a reference of standard pressure. Barĭefinition: A bar (symbol: bar) is a metric unit of pressure that is defined as exactly 100,000 pascals (symbol: Pa). Although the pascal is more widely used in scientific contexts, psi is more often used in everyday contexts, particularly in countries like the United States as well as others under the US customary or imperial systems of units. As such, the prototype pound at the time was known as the avoirdupois wool pound.Ĭurrent use: The psi is fairly widely used to measure numerous pressures, such as tire pressure, scuba tank pressure, natural gas pipeline pressure, among others. The system is believed to have come into use in England around 1300 and was used in the international wool trade. It is based on the avoirdupois system, a system that uses weights in terms of the avoirdupois pound, which was standardized in 1959. History/origin: Pound-force per square inch is a unit that originated in the imperial and US customary systems of units. One psi is approximately 6,895 pascals (N/m 2). It is defined as the pressure that results when a force of one pound-force is applied to a one-square-inch area. Definition: A pound-force per square inch (symbol: psi) is an imperial and US customary unit of pressure based on avoirdupois units.
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